Disabling a plugin loading when launching Vim from `git commit`

Question

Is there a way to disable a plugin only on occasions where Vim was launched from another program?

I have set Vim (Neovim, more specifically) to be the default core.editor of my git configuration and let's say I have these plugins in my .vimrc loading through vim-plug:

" Plugins to load with Vim
call plug#begin('~/.vim/plugged')

    Plug 'preservim/nerdtree' | Plug 'Xuyuanp/nerdtree-git-plugin'
    Plug 'itchyny/lightline.vim'
    Plug 'ryanoasis/vim-devicons'

call plug#end()

" Some variables and vimscripts directly related to a plugin
let NERDTreeShowHidden = 1

autocmd VimEnter * NERDTree | wincmd p
autocmd BufWinEnter * if getcmdwintype() == '' | silent NERDTreeMirror | endif

In this case, I just want to have a clean buffer ready for me to insert the commit message, so is it possible to make Vim ignore some of these plugins when commiting?

---

In other words:

• Is Vim capable of understanding that it was launched through git commit (or merely git)?
• Should it be capable, how must I change my .vimrc (either on the example above where the plugins are called or somewhere else in the file) in order to disable plugins I don't need?
  • In this case, anything related to NERDTree is irrelevant when commiting, so nerdtree, nerdtree-git-plugin and vim-devicons should be disabled while lightline.vim will keep getting loaded;
• In case I manage to disable plugins under these circumstances, should I be aware of any further changes in variables and scripts that call upon these disabled plugins (such as the ones shown above)?

Answer 1

git sets a number of environmental variables when invoked, if they're not already set in the environment. I would just test for one of those and conditionally run the NERDTree commands accordingly.

if !exists('$GIT_EXEC_PATH')
    autocmd VimEnter * NERDTree | wincmd p
    autocmd BufWinEnter * if getcmdwintype() == '' | silent NERDTreeMirror | endif
endif